My understanding is that Logitech have now discontinued all Harmony remotes, as of around April 2021. Support for current models apparently remains, for now, but the future seems uncertain.

They claim that in this current world of the connected home the need for a Universal Remote is already delivered via the IoT.

I, for one, think this is a shame and have stood by and watched Logitech slowly erode the value in what used to be a flagship brand.

RIP Harmony - Logitech, not so much - stick to mice and keyboards.